Heres a Pneumonic Device to help you with remembering the Metric System.
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Kilo Hecto Deca Base Deci Centi Milli
So 2.5cm = 25mm.
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2.5
25 cm equals 250mm...
it 10 mm equals 1 cm then 500 mm equals 50 cm so then 580 mm equals 58 cm so the answer is 58.1 cm
10 mm in a cm 9.8 cm
15 mm, there are 10 mm in a 1 cm